header{
    width: 100%;
    height: 1.6rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-left: 20px;
    background: #f1eeee;
    position: fixed;
    top: 0px;
    left: 0px;
    /* outline: 1px solid red; */
}
header > a{
    display: inline-block;
    width: 20px;
    height: 20px;
    /* outline: 1px solid red; */
}
header > a>img{
    width: 100%;
    height: 100%;
}
header > span{
    flex: 1;
    text-align: center;
    font-size: 20px;
    /* outline: 1px solid red; */
}